Been away awhile from the old UVb thread.

I have a scientific white paper "Possible role of Ultrasviolet Radiation in Evolution of Cannabis Chemotypes" by William W. Pate from '81. I have tried to post it here but is 10 pages of pdf and to large to upload. Previously I had been able to brake these things into 2 parts, but I have had no success. (I don't seem to have word on this newer computer and the clipboard has been non co-operative.) If I ever figue it out I will post it.

@ clongo, one of the reasons we used pyrex (cornning product) bake arounds was that pyrex is boroscilicate glass. From everything I've read about it, it does not filter visiible light only UV...and that includes most of the UVa and all UVb and UVc. That plus the first experiment (at beginning of thread) was a back to back experiment. The lights in that test were in a boroscilicate cool tube, and the UVb were separate lights. Used them in one flowering run and did not use in another. My conclusions are that blue light was present in both and differences were directly attributable to UVb exposure.

BTW I have had a copy of the PAD manual since 12/09, while it lists the time factor for various light, I am still trying to find the scientific basis behind it.
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OM